Journal
JOURNAL OF POWER SOURCES
Volume 184, Issue 1, Pages 276-283Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2008.05.091
Keywords
cathode materials; rechargeable lithium batteries; Co-3(PO4)(2) coating; cycle performance; rate capability
Funding
- National IT Industry Promotion Agency (NIPA), Republic of Korea [2005-S-106-03, 2005-S-106] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [과C6B2301] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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To prepare a high-capacity cathode material with improved electrochemical performance for lithium rechargeable batteries, Co-3(PO4)(2) nanoparticles are coated on the surface of powdered Li[Co0.1Ni0.15Li0.2Mn0.55]O-2, which is synthesized by a simple combustion method. The coated powder prepared under Proper conditions for Co-3(PO4)(2) content and annealing temperature shows an optimum coating layer that consists of a LixCoPO4 phase formed by reaction with lithium impurities during heat treatment. A sample coated with 3 wt.% Co-3(PO4)(2) and annealed at 800 degrees C proves to be the best in terms of specific capacity, cycle performance and rate capability. Thermal stability is also enhanced by the coating, as demonstrated a decrease in the onset temperature and/or the heat generated during thermal runaway. (C) 2008 Elsevier B.V. All rights reserved.
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